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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2012/07/27 07:11:35 UTC

[jira] [Comment Edited] (HBASE-6427) Pluggable compaction policies via coprocessors

    [ https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423679#comment-13423679 ] 

Lars Hofhansl edited comment on HBASE-6427 at 7/27/12 5:11 AM:
---------------------------------------------------------------

v3... Fixes some things, and verifies the new scenarios.
Still not quite done, yet, just need a place to "park" it.
preStoreScannerOpen will be called for Gets (which is good), including internal Gets (or append/increment/delete/etc). I *think* this is OK in all cases, but need to make sure.

Edit: Spelling
                
      was (Author: lhofhansl):
    v3... Fixes some things, and verifies the new scenarios.
Still not quite done, yet, just need a place to "park" it.
preStoreScannerOpen will be called for Gets (which is good), including internal Gets (or append/increment/delete/etc. I *think* this is OK in all cases, by need to make sure.
                  
> Pluggable compaction policies via coprocessors
> ----------------------------------------------
>
>                 Key: HBASE-6427
>                 URL: https://issues.apache.org/jira/browse/HBASE-6427
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
>         Attachments: 6427-notReady.txt, 6427-v1.txt, 6427-v2.txt, 6427-v3.txt
>
>
> When implementing higher level stores on top of HBase it is necessary to allow dynamic control over how long KVs must be kept around.
> Semi-static config options for ColumnFamilies (# of version or TTL) is not sufficient.
> The simplest way to achieve this is to have a pluggable class to determine the smallestReadpoint for Region. That way outside code can control what KVs to retain.

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